The flashback of Mr. Rogers visiting Yo-Yo Ma and his son is from show 1625, "Fathers and Music (5)."
The song You Are Special is incorrectly identified as "You Are My Friend" by The Caption Center at WGBH.
Mr. Rogers assembles the usual NOM models on the kitchen table, but when Mrs. McFeely arrives and he walks through the living room before he can begin Make-Believe, you can clearly see the trolley out on its tracks. When he walks back to the kitchen, you can see it there as well. However, after Make-Believe is over and he puts the models away and goes back into the living room, the trolley is gone.
"I'll say," were the last words Bob Dog would ever say in English.
This was Mrs. McFeely's last appearance, although she would continue to be mentioned.